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INVESTIGATIVE AREA 12 OPERABLE UNIT-2 INTERIM REMEDIAL MEASURE PROGRESS REPORT HOFFMANN-LA ROCHE INC. SITE, 340 KINGSLAND STREET, NUTLEY, NEW JERSEY
Hoffmann-La Roche Inc., 21 pp, 2019

Operable unit (OU) 2 of the Hoffman-La Roche Inc. site was contaminated with >1,000 to <10,000 µg/L PCE and its degradation products (PCE+) in groundwater to a depth of approximately 50 ft below ground surface. A successful pilot study from October 2014-January 2015 evaluated the effectiveness of and established design parameters for treating PCE+ in groundwater using in-well air stripping (IWAS) enhanced with in situ chemical oxidation (ISCO). A full-scale system that encompassed ~46,000 ft2 in the central portion of IA-12 was subsequently installed as an interim remedial measure. (IRM) Three separate treatment systems operated from July 2016 through 2017. Seventy-eight ISCO wells injected ozone in all areas and supplemental activated sodium persulfate was injected in one area. Twenty-five IWAS wells and 16 vapor extraction trenches along the perimeter of the main injection treatment areas were installed to promote additional vapor recovery and capture sparged gases. Groundwater sampling results through October 2018 showed a significant overall reduction in PCE+ concentrations. An overall 69% reduction in PCE+ concentrations was achieved at system shutoff in December 2017. Only minor rebound/recontamination was observed with an overall 55% reduction in PCE+ concentrations was attained 10 months after cessation of IRM. https://www.roche-nutley.com/content/dam/roche-nutley/en/documents/RocheNutley/pdfs/gw_irm_apr_19/2019-4-18_IA-12_OU-2%20IRM%20RptTEXT.pdf



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